[WxPython] Setting interdependencies between checkboxes

[merlem]

Aim is to show the user that he shouldn't check some items if he already has chosen others.
(He should be able to do so, just get a hint, maybe even a warning.)

But how to do that?
My first idea was to couple a CheckListBox with a Tree-State-Checkbox. However, it seems to be impossible to set a CheckBox in a CheckListBox into the "third state" by code. (One can do so for simple CheckBoxes, but not if they are part of a list, as one cannot pass the index of the item in question.)

It's not that a third state would be mandatory; if I could 'grey out' the item strings, that would do the same thing (carrying some information to the user). But I found no way to influnce those strings, the only way would then be to destroy the CheckListBox completely and make a new one (and even then I'm not sure whether I could influence the text color, but I didn't check for that until now).

So, I changed to ListBoxes that are created due to a list.

But now I met the problem that I need something to 'adress' the single boxes, indicated in the code here by '***'. (The code cannot work in this version, of course.)

# -*- coding: cp1252 -*-

import wx

tliste = ["a", "b", "c", "d"]
states = {}

class Mainframe(wx.Frame):
    def __init__(self, parent, id, title):
        wx.Frame.__init__(self, parent, id, title)

        self.mainbox = mainbox = wx.BoxSizer(wx.VERTICAL) 
        
        for tafn in tliste:
            choname = "cho" + tafn
            states[choname] = {"st": "", "afn": tafn}
            self.*** = wx.CheckBox(self, wx.ID_ANY,
                    label = tafn,
                    style = wx.CHK_3STATE|wx.CHK_ALLOW_3RD_STATE_FOR_USER)
        
            self.Bind(wx.EVT_CHECKBOX, self.EvtCheckBox, self.***)

            mainbox.Add(self.***)
            
        self.SetSizer(mainbox)

        self.Show()

    def EvtCheckBox(self, event):
        for chon in states.keys():
            chosenind = self.***.Get3StateValue()
            print "chosenind of ", chon, ": ", chosenind
            
if __name__ == "__main__": 

    app = wx.App(0)
    preframe = Mainframe(None, -1, "Anfangsauswahl")   
    app.MainLoop() 

Is there any possibility to create some identifier in such a case? Or are there other options to change the behavior of CheckBoxes depending on what other CheckBoxes are set to a given state?

[Yoriz]

I think this could be what you are looking for, keep the checkbox controls in a list as shown below.

# -*- coding: cp1252 -*-

import wx

tliste = ["a", "b", "c", "d"]
# states = {}


class Mainframe(wx.Frame):

   def __init__(self, parent, id, title):
       wx.Frame.__init__(self, parent, id, title)

       self.mainbox = mainbox = wx.BoxSizer(wx.VERTICAL)
       self.checkboxes = []

       for tafn in tliste:
           #             choname = "cho" + tafn
           #             states[choname] = {"st": "", "afn": tafn}
           checkbox = wx.CheckBox(
               self, wx.ID_ANY, label=tafn,
               style=wx.CHK_3STATE | wx.CHK_ALLOW_3RD_STATE_FOR_USER)

           self.Bind(wx.EVT_CHECKBOX, self.on_evt_checkbox, checkbox)

           mainbox.Add(checkbox)
           self.checkboxes.append(checkbox)

       self.SetSizer(mainbox)

       self.Show()

   def on_evt_checkbox(self, event):
       for checkbox, chon in zip(self.checkboxes, tliste):
           chosenind = checkbox.Get3StateValue()
           print "chosenind of {0}: {1}".format(chon, chosenind)

if __name__ == "__main__":

   app = wx.App(0)
   preframe = Mainframe(None, -1, "Anfangsauswahl")
   app.MainLoop()

[merlem]

That works perfectly  !

Thanks a lot!